Another good way is to do push-ups with pectoral muscles and biceps. Don't finish it quickly 15 people in a group. Feel the chest muscles being pulled slowly. Don't get up after the first group, rest your feet for a minute, then do another group, and so on until you can't hold on. After a month, you will definitely train your chest muscles. The point is to get up slowly and not get up. Hang in there, it's not a day or two to practice your muscles.